Balance Sheet and Other Details - Property and Equipment, Net (Details) - USD ($) $ in Millions	Jan. 29, 2022	Jul. 31, 2021
Property, Plant and Equipment [Line Items]
Operating lease assets	$ 245	$ 273
Total gross property and equipment	10,622	10,918
Less: accumulated depreciation and amortization	(8,482)	(8,580)
Total	2,140	2,338
Land, buildings, and building and leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property and equipment, excluding operating lease assets	4,293	4,304
Computer equipment and related software
Property, Plant and Equipment [Line Items]
Gross property and equipment, excluding operating lease assets	852	858
Production, engineering, and other equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment, excluding operating lease assets	4,879	5,106
Furniture, fixtures and other
Property, Plant and Equipment [Line Items]
Gross property and equipment, excluding operating lease assets	$ 353	$ 377